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Media type:
E-Article
Title:
Effects of Morphactin on Indol-3yl-acetic Acid Transport, Growth, and Geotropic Response in Cereal Coleoptiles
Contributor:
BRIDGES, IAN G.;
WILKINS, MALCOLM B.
Published:
OXFORD AT THE CLARENDON PRESS, 1973
Published in:
Journal of Experimental Botany, 24 (1973) 81, Seite 711-723
Language:
English
ISSN:
0022-0957;
1460-2431
Origination:
Footnote:
Description:
The effects of the morphactin 2-chloro-9-hydroxyfluorene-9-carboxylic acid methyl ester [CFM] on growth, geotropic curvature and transport and metabolism of indol-3yl-acetic acid [IAA-5-3H] in the coleoptiles of Zea mays and Avena sativa have been investigated. A strong correlation has been found to exist between the inhibition of the geotropic response and the inhibition of auxin transport. CFM supplied at concentrations sufficient to abolish auxin transport has been shown to promote the elongation of Zea, but not of Avena, coleoptile segments. CFM does not change the pattern of metabolism of IAA in Zea coleoptile segments. In these segments IAA is metabolized when its concentration is high, but the radioactivity transported basipetally, or laterally in geotropically stimulated coleoptiles, is virtually confined to the IAA molecule. Radioactivity exported into the basal receiver blocks is wholly confined to IAA. It is concluded that CFM inhibits the geotropic response in coleoptiles by suppression of the longitudinal and lateral auxin transport mechanisms. The growth-promoting properties of this substance cannot be linked with its effects on either auxin metabolism or transport.